To convert length x width dimensions from inches to centimeters we should multiply each amount by the conversion factor. One inch equals 2.54 centimeters, in order to convert 12 x 21 inches to cm we have to multiply each amount of inches by 2.54 to obtain the length and width in centimeters. In this case to convert 12 x 21 inches into cm we should multiply the length which is 12 inches by 2.54 and the width which is 21 inches by 2.54. The result is the following:
12 x 21 inches = 30.48 x 53.34 cm
An inch (symbol: in) is a unit of length. It is defined as 1⁄12 of a foot, also is 1⁄36 of a yard. Though traditional standards for the exact length of an inch have varied, it is equal to exactly 25.4 mm. The inch is a popularly used customary unit of length in the United States, Canada, and the United Kingdom.
The centimeter (symbol: cm) is a unit of length in the metric system. It is also the base unit in the centimeter-gram-second system of units. The centimeter practical unit of length for many everyday measurements. A centimeter is equal to 0.01 (or 1E-2) meter.
To calculate an inch value to the corresponding value in centimeters, just multiply the quantity in inches by 2.54 (the conversion factor).
centimeters = inches * 2.54
The factor 2.54 is the result from the division 1 / 0.393701 (centimeter definition). Therefore, another way would be:
centimeters = inches / 0.393701
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